1400$ is divided between two accounts. One account pays 3% interest, while the other pays 4% interest. At the end of one interest period, the interest earned was 50$. How much was invested in each account?

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.